๐Ÿ›ก๏ธ CVE-2026-27855
๐ŸŸก CVSS 6.8 โ€” Medium โœ… No Known Exploit CWE-294 NVD
6.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.

Details

Severity MEDIUM
CVSS Score 6.8
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE CWE-294
Public Exploit โœ… No
Source NVD
Published 2026-03-27
Updated 2026-06-02
Modified 2026-04-29
Fix URL N/A

Affected Packages

Software From version Fixed in
dovecot โ€” 2.3.0

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